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POExtending a contour in OpenCv
 

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  1. POExtending a contour in OpenCv
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    <p>i have several contours that consist of several black regions in my image. Directly adjacent to these black regions are some brighter regions that do not belong to my contours. I want to add these brighter regions to my black region and therefor extend my contour in OpenCv.<br> Is there a convenient way to extend a contour? I thought about looking at intensity change from my gradient-image created with <code>cv::Sobel</code> and extend until the gradient changes again, meaning the intensity of pixel is going back to the neither black nor bright regions of the image. </p> <p>Thanks!</p> <p>Here are example images. The first picture shows the raw Image, the second the extracted Contour using Canny &amp; findContours, the last one the Sobel-Gradient intensity Image of the same area. I want to include the bright boundaries in the first image to the Contour.</p> <p><img src="https://i.stack.imgur.com/QmApm.png" alt="enter image description here"> <img src="https://i.stack.imgur.com/UfDdd.png" alt="enter image description here"> <img src="https://i.stack.imgur.com/KOVr9.png" alt="enter image description here"></p> <p>Update: Now i've used some morphological operations on the Sobelgradients and added a contour around them (see Image below). Next step could be to find the adjacent pair of purple &amp; red contours, but it seems very much like a waste of procession time to actually have to search for directly adjacent contours. Any better ideas?</p> <p><img src="https://i.stack.imgur.com/PN69J.png" alt="enter image description here"></p> <p>Update 2: My solution for now is to search for morphed gradient (red) contours in a bounding box around my (purple) contours and pick the one with correct orientation &amp; size. This works for gradient contours where the morphological operation closes the "rise" and "fall" gradient areas like in Figure 3. But it is still a bad solution for cases in which the lighted area is wider then in the image above. Any idea is still very much appreciated, thanks!</p>
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    1. COPlease provide a sample image !!!
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    2. COOkay, added some pictures and clarification to my question.
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